Math calculators

Everyday arithmetic, algebra, and geometry — worked out clearly.

Percentages, fractions, ratios, geometry, and the little calculations that come up all the time — with formulas you can reuse anywhere.

Calculators
244
Topics: All Percentage (75) Fractions (4) Geometry (63)
244 results
Math / Geometry

Annulus (Ring) Area Calculator

Compute the area of an annulus (the region between two concentric circles) from the outer and inner radii: A = π · (R² −...

basic
21,420 4.8 1 min
Math / Percentage

Number Base Converter

Convert a number written in any base from 2 to 36 into any other base from 2 to 36, with companion outputs in binary, oc...

basic
15,955 4.7 1 min